Added some new scaladocs, and adjusted existing ones, mainly in package matchers.
Fixed a bug in MatchResult where midSentenceFailureMessage should use midSentenceFailureMessageArgs, and midSentenceNegatedFailureMessage should use midSentenceNegatedFailureMessageArgs for message construction.
Completed scaladoc in MatchResult, and removed one of the factory method in MatchResult companion object as it is replaced by default prettifier parameter in the main constructor.
Added scaladoc to LazyArg.
Added scaladoc to MatcherProducers.
Completed scaladoc in Matcher.scala.
Adjusted scaladoc in GenFactories.scala.
Completed scaladoc in Aggregating.scala.
Further adjusted scaladoc in Aggregating.scala.
Completed scaladoc in Containing.scala.
Merge branch 'scaladoc' of https://github.com/cheeseng/scalatest